AsianScientist (Apr. 26, 2018) – During rare desert rainfalls, cacti waste no time sopping up and storing a storm’s precious precipitation. Inspired by this natural phenomenon, scientists report in a study appearing ACS Macro Letters that they have developed a material that mimics cactus roots’ ability to rapidly absorb and retain vast amounts of water with a minimal amount of evaporation.
Like all living things, cacti need water to survive. Yet they thrive in some of the world’s driest places. The key is the plant’s shallow, but extensive root system that quickly soaks up rainfall, which seldom penetrates more than just a few inches into the soil.
During droughts, cactus roots dehydrate and shrink, creating air gaps that prevent water from escaping back into the soil. Intrigued by these traits, a team of researchers at the Pohang University of Science and Technology in South Korea created a durable material that could effectively absorb and store water.
To imitate the cactus root and its outer covering, the team led by Professor Lee Sang Joon made a material composed of cellulose fibers, agarose cyrogel and microparticles. Then, they made a cylindrical-shaped gel and freeze-dried it to form a structure that mimics the layered composition of cactus root epidermis.
Laboratory tests suggest that the resulting cactus root-inspired material is capable of absorbing water nearly 930 times faster than it loses through evaporation.
The researchers say the mixture of cellulose fibers, microparticles and cryogel is adjustable for particular needs. For example, adding water-repellant microparticles to this system could produce materials for oil separation and other oil-based engineering processes. The researchers conclude that their cactus root-inspired material could eventually have a host of applications in agriculture, cosmetics and medicine.
The article can be found at: Kim et al. (2018) Fast and Efficient Water Absorption Material Inspired by Cactus Root.
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Source: American Chemical Society; Photo: Pexels.
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